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Physics MCQs

177 Questions Subject Test
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161
Medium fpsc Uploaded: 06 Aug 2026

Which part of the electromagnetic spectrum has the shortest wavelength?

  • A Radio waves
  • B Gamma rays
  • C Visible light
  • D Infrared
Permalink
Correct Answer: Option B — Gamma rays
Explanation: Gamma rays have the shortest wavelength and highest frequency and energy within the electromagnetic spectrum. They are produced by nuclear reactions and radioactive decay, and require significant shielding due to their high penetrating power.
Submitted by: PaperMCQs
162
Medium fpsc Uploaded: 06 Aug 2026

Which physicist proposed the theory of general relativity?

  • A Max Planck
  • B Albert Einstein
  • C Niels Bohr
  • D Isaac Newton
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Correct Answer: Option B — Albert Einstein
Explanation: Albert Einstein proposed the theory of general relativity in 1915, which describes gravity not as a force but as a curvature of spacetime caused by mass and energy. This revolutionary theory transformed our understanding of gravity and the universe.
Submitted by: PaperMCQs
163
Medium fpsc ppsc nts Uploaded: 13 Jul 2026

Which device converts mechanical energy into electrical energy?

  • A Motor
  • B Transformer
  • C Generator
  • D Battery
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Correct Answer: Option C — Generator
Explanation: A generator converts mechanical energy into electrical energy through electromagnetic induction as a rotating coil moves within a magnetic field inducing an electric current.
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164
Medium fpsc ppsc nts Uploaded: 13 Jul 2026

Which law explains why rockets can propel themselves in space?

  • A Newton's First Law
  • B Newton's Third Law
  • C Bernoulli's Principle
  • D Newton's Second Law
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Correct Answer: Option B — Newton's Third Law
Explanation: Rockets work on Newton's Third Law as gases expelled backward at high speed produce an equal and opposite forward thrust allowing propulsion even in the vacuum of space.
Submitted by: PaperMCQs
165
Easy fpsc Uploaded: 17 Aug 2026

The Bohr model of the atom proposed that electrons move in:

  • A Fixed circular orbits with quantized energy levels
  • B Random paths
  • C Straight lines only
  • D Elliptical orbits with continuous energy
Permalink
Correct Answer: Option A — Fixed circular orbits with quantized energy levels
Explanation: Niels Bohr proposed that electrons orbit the nucleus in specific, fixed circular paths with quantized energy levels, and electrons can jump between these levels by absorbing or emitting discrete amounts of energy.
Submitted by: PaperMCQs
166
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

What is the SI unit of electric current?

  • A Volt
  • B Ohm
  • C Ampere
  • D Watt
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Correct Answer: Option C — Ampere
Explanation: The Ampere named after French physicist Andre-Marie Ampere is the SI base unit of electric current representing the flow of one coulomb of charge per second.
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167
Hard fpsc Uploaded: 17 Aug 2026

Which type of friction is generally the smallest?

  • A Static friction
  • B Kinetic friction
  • C Sliding friction
  • D Rolling friction
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Correct Answer: Option D — Rolling friction
Explanation: Rolling friction is typically much smaller than static or kinetic sliding friction because rolling objects, like wheels, experience less deformation and resistance at the contact point compared to sliding surfaces.
Submitted by: PaperMCQs
168
Medium css fpsc ppsc Uploaded: 05 Aug 2026

Which type of electromagnetic wave has the highest frequency and energy in the spectrum?

  • A Radio waves
  • B X-rays
  • C Gamma rays
  • D Ultraviolet
Permalink
Correct Answer: Option C — Gamma rays
Explanation: Gamma rays have the highest frequency and energy in the electromagnetic spectrum produced by nuclear reactions and radioactive decay and can only be blocked by thick lead or concrete.
Submitted by: PaperMCQs
169
Hard css fpsc Uploaded: 13 Jul 2026

Which principle states that no two electrons in an atom can have the same set of four quantum numbers?

  • A Heisenberg Uncertainty Principle
  • B Superposition Principle
  • C Aufbau Principle
  • D Pauli Exclusion Principle
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Correct Answer: Option D — Pauli Exclusion Principle
Explanation: The Pauli Exclusion Principle states that no two electrons in an atom can have identical sets of all four quantum numbers meaning each orbital can hold at most two electrons with opposite spins.
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170
Hard fpsc Uploaded: 06 Aug 2026

Which quantity remains unchanged when a transformer changes voltage in an ideal system?

  • A Power
  • B Current
  • C Resistance
  • D Frequency only
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Correct Answer: Option A — Power
Explanation: In an ideal transformer, the input power equals the output power since no energy is lost, meaning any increase in voltage is accompanied by a proportional decrease in current, keeping overall power constant.
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171
Medium css fpsc ppsc Uploaded: 13 Jul 2026

What is the SI unit of capacitance?

  • A Henry
  • B Farad
  • C Tesla
  • D Ohm
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Correct Answer: Option B — Farad
Explanation: The Farad is the SI unit of capacitance named after Michael Faraday defined as the capacitance of a capacitor that stores one coulomb of charge at one volt potential difference.
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172
Medium fpsc Uploaded: 17 Aug 2026

The device used to measure potential difference in a circuit is called a:

  • A Voltmeter
  • B Galvanometer
  • C Wattmeter
  • D Ammeter
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Correct Answer: Option A — Voltmeter
Explanation: A voltmeter is an instrument used to measure the potential difference, or voltage, between two points in a circuit, and it must be connected in parallel across the component being measured.
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173
Medium css fpsc ppsc Uploaded: 13 Jul 2026

Which scale of temperature is used in thermodynamic calculations and starts at absolute zero?

  • A Kelvin
  • B Celsius
  • C Fahrenheit
  • D Rankine
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Correct Answer: Option A — Kelvin
Explanation: The Kelvin scale is the SI thermodynamic temperature scale starting at absolute zero and used in all scientific thermodynamic calculations because it has no negative values.
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174
Medium fpsc ppsc nts Uploaded: 13 Jul 2026

What is the process by which a solid changes directly into a gas without passing through the liquid phase?

  • A Evaporation
  • B Sublimation
  • C Condensation
  • D Vaporisation
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Correct Answer: Option B — Sublimation
Explanation: Sublimation is the direct phase transition from solid to gas without passing through the liquid state as demonstrated by dry ice converting to carbon dioxide gas.
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175
Hard fpsc Uploaded: 17 Aug 2026

Which of the following travels fastest in vacuum?

  • A Sound waves
  • B Light waves
  • C Seismic waves
  • D Water waves
Permalink
Correct Answer: Option B — Light waves
Explanation: Light waves, being electromagnetic radiation, travel at approximately 3 x 10^8 metres per second in a vacuum, far faster than mechanical waves like sound, which require a physical medium to propagate.
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176
Medium css fpsc ppsc Uploaded: 13 Jul 2026

Which type of radiation consists of helium nuclei emitted from an unstable nucleus?

  • A Alpha radiation
  • B Beta radiation
  • C Gamma radiation
  • D Neutron radiation
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Correct Answer: Option A — Alpha radiation
Explanation: Alpha radiation consists of particles identical to helium-4 nuclei containing two protons and two neutrons emitted from heavy unstable nuclei during radioactive decay.
Submitted by: PaperMCQs
177
Medium fpsc Uploaded: 17 Aug 2026

A fuse in an electrical circuit is used to:

  • A Protect the circuit from excessive current
  • B Store electrical energy
  • C Increase voltage
  • D Convert AC to DC
Permalink
Correct Answer: Option A — Protect the circuit from excessive current
Explanation: A fuse is a safety device containing a thin wire that melts and breaks the circuit when current exceeds a safe limit, protecting household wiring and appliances from damage due to overloading.
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